V.D.2.e Double-Detection Mode

IRAS Explanatory Supplement
V. Data Reduction
D. Point Source Confirmation
D.2 Overview of Seconds-Confirmation
D.2.e Double-Detection Mode


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The double-detection mode was the most common mode of seconds-confirmation. A combined test on flux and position was applied which consisted of a two-degree-of-freedom 2 test. The n- position discrepancy contributed one of the degrees of freedom, and the discrepancy in the log of the two fluxes in units of the log-flux standard deviation provided the other. A threshold value corresponding to sacrificing one real event out of every hundred thousand was used for this test for unconfused cases, and one corresponding to sacrificing one real source in a million was used for cases which had been processed for confusion before arriving at this point. If this test failed, the drop-dead fell back to rejection processing as described above; otherwise parameter refinement was performed for the flux and position (see below), and the next detection was processed.
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